n: 40 m: 539 packed: 13 density: 0 nodes: 0 solveTime: 19840 buildTime: 170 solved: true
{0,19,21}
{1,8,12}
{2,10,11}
{3,7,16}
{5,27,30}
{6,9,38}
{13,20,23}
{14,15,26}
{17,35,37}
{18,22,32}
{24,34,39}
{25,31,33}
{28,29,36}